Novel pyrazolidone derivatives in pharmaceutical compositions and methods

ABSTRACT

DIPHENYLPYRAZOLIDONE DERIVATIVES, SUBSTITUTED ON THE 4 POSITION AND HAVING THE FORMULA:   1,2-DIPHENYL,4-R,4-(CH3-(CH2)3-)-PYRAZOLIDINE-3,5-DIONE   WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF GLYCOSES OF FROM 3 THROUGH 6 CARBONS IN CHAIN LENGTH, POLYOXYETHYLENE HAVING A MOLECULAR WEIGHT OF FROM 200 THROUGH 2000 AND AN IONIC EXCHANGE RESIN WHICH IS A POLYMERIC CONDENSATION PRODUCT OF A PHENOL, FORMALDEHYDE AND AN ALKYLENE POLYAMINE WHIC ARE KNOWN IN THE TRADE AS AMBERLITE RESINS, AND HYDROGEN BONDED COMPOUNDS OF THE STRUCTURE: 1,2-DIPHENYL,3-(O=),4-(CH3-(CH2)3-),4,5-(-Z-O-)PYRAZOLIDINE WHEREIN Z IS A COMPOUND OF THE GROUP SELECTED FROM ALGIN, GUM GUAR, PECTIN, PSYLLIUM, DEXTRAN AND POLYVINYLPYRROLIDONE AND THE METHODS FOR THE PREPARATION OF THE AFORESAID COMPOUNDS. THE COMPOUNDS ARE USEFUL IN ACHIEVING AN ANTI-INFLAMMATORY EFFECT.

United States Patent US. Cl. 424-273 Claims ABSTRACT OF THE DISCLOSURE Diphenylpyrazolidone derivatives, substituted on the 4 position and having the formula:

wherein R is selected from the group consisting of glycoses of from 3 through 6 carbons in chain length, polyoxyethylene having a molecular weight of from 200 through 2000 and an ionic exchange resin which is a polymeric condensation product of a phenol, formaldehyde and an alkylene polyamine which are known in the trade as Amberlite resins, and hydrogen bonded compounds of the structure:

wherein Z is a compound of the group selected from algin, gum guar, pectin, psyllium, dextran and polyvinylpyrrolidone and the methods for the preparation of the aforesaid compounds. The compounds are useful in achieving an anti-inflammatory effect.

This application is a division of Applicants co-pending Application Serial No. 856,508, now US. Pat. No. 3,629,- 282, filed May 14, 1969 which was a division of Applicants then co-pending Application Serial No. 691,197, now US. Pat. No. 3,487,046, filed Dec. 18, 1967, which was a continuation-in-part of Applicants then co-pending Application Serial No. 362,393, filed Apr. 24, 1964, now abandoned, which was a continuation-in-part of Applicants then co-pending Application Serial No. 121,796, filed Apr. 24, 1961, now abandoned.

The present invention relates to new and novel compounds prepared from pyrazolidone, their process of manufacture and their pharmaceutical and therapeutic usage in both human and veterinary medicine. In particular, the present invention is concerned with mono and 3,833,729 Patented Sept. 3, 1974 polyglycosidic compounds, polyoxyethylene compounds and hydrogen bonded compounds of 3,5-dioxo 1,2 diphenyl-4-n-butyl pyrazolidine. These compounds have a therapeutic and pharmacologic utility which is unique and possessing of advantages over the older therapeutic agents.

A problem in the treatment of arthritis and certain of the related pathologic states is one which is constantly present in the practice of both human and veterinary medicine. While many pharmacologic approaches to therapy have been suggested and many chemical entities synthesized and described as having a therapeutic effect, the clinician must still meet the problem of deciding upon the specific drug to treat a specific patient who presents symptoms which fall into the accepted pathological criterion for these diseases.

In recent years, a pyrazolidone derivative, namely 3,5- dioxo-1,2-dipheny1 4 n butyl pyrazolidine, has been utilized with clinical success in the treatment of various arthralgic states despite a number of inherent limitations. The common name for this compound is phenylbutazone. Phenylbutazone has been demonstrated to have a marked capacity to raise the pain threshold in laboratory animals, as well as exerting an antipyretic elfect. Phenylbutazone exhibits anti-inflammatory properties in animals similar to Cortisone, and although it has been shown that its action is not mediated through the pituitary-adrenal cortex axis, it causes sodium retention which may lead to edema. Tissue respiration studies have shown that the oxygen consumption of brain tissue is lowered as is the utilization of glucose by the tissues.

It has been demonstrated that henylbutazone is slowly metabolized in man. The rate of biotransformation varies with different subjects although the range has been postulated to be from 10 percent to 40 percent a day.

It is well known that virtually small doses, as for example, 10 mg. percent in the blood stream, is required for the anti-flammatory beneficial therapeutic eifect to be observed in patients with rheumatoid arthritis.

Phenylbutazone is extremely insoluble in water. In order to achieve solubility so that it may be administered and absorbed orally or by injection, the alkali metal salt has been formed. The sodium salt has received preference. The sodium salt of phenylbutazone thus formed, and its solution, are stable only in the more alkaline pH range because of the weak ionic strength of the pyrazolidine derivative and breakdown or decomposition occurs when the pH of the medium is less than 8.2.

This decomposition at a critical pH of 8.2 is highly significant since the physiological pH range is rarely above pH 7.6 and almost always between the range of pH 7.2 and pH 7.4. Moreover, when this drug (viz the sodium salt), is administered orally, there is a virtually complete and instantaneous decomposition by the stomach contents which rarely, if ever, rise above pH 4 and most often is at pH 1 to 2. This decomposition of the alkali metal salts, moreover, results in an insoluble base substance which is then variably absorbed at a level limited to the solubility-product transfer, which conforms to the rates expressed by the law of mass action relating to substances difiicultly soluble and decomposable in a dynamic system.

The consequences of this variable absorption and insolubility are best observed by the high dose range required for therapy. As much as 1 gm. has been commonly used. Larger amounts are employed for the treatment of certain patients having more serious disease.

The first effect observed, as a result of the precipitation of the base material of the sodium, salt in the stomach, is a delayed onset of eifect until therapeutic blood levels are reached. This delay of onset of etfect is readily apparent to the clinician and is described by him as the period of therapeutic latency. This latent therapeutic period is absent when the drug is administered parenterally, thus establishing that this phenomenon is due to the variable absorption which results in ineffective blood levels or until enough of the drug accumulates in the blood to exceed the threshold level of activity. Thus, with a biometabolic destruction rate of from 16 percent to 40 percent per day, the factor of the rate of development of the therapeutic blood level is governed only by the amount being absorbed in excess of this destruction.

Still another inherent limitation has arisen with the use of phenylbutazone which has caused the caution the use must be enjoined with a careful follow-up of the patients blood picture as well as restriction against long-term use in effective upper level doses, and this limitation is one of a blood dyscrasia (agranulocytosis). Liver damage has also been suggested.

The products of the present invention, by rendering 3,5- dioxo-1,2-dipheny1-4-n-butyl pyrazolidine either more soluble in physiologic media or by the control of the rate of absorption through alteration of the physical transport mechanisms involved by controlling the availability of the drug for absorption in accord with the demand of the dynamic system, avoids the above limitations of insolubility and/or variable absorption. Thus, the products of our invention may be given in lower dosage to achieve the same level of therapeutic elfect, since they are either more soluble and/or more predictable in absorption, and the dosage administered to the individual patient may therefore be controlled so as to supply that quantity which is metabolized during a given period without permitting excesses to accumulate and cause its noxious toxic effect on the patient.

The individual determination of the rate of metabolism in the individual patient presents no problem since the metabolized compound is excreted via the kidney and reliable as well as sensitive methods of analysis are available and presently being practiced by the laboratory technician in both hospitals and private physicians laboratories.

Therefore an aifective, as well as reliable, means of avoiding the therapeutic limitations inherent in the compound phenylbutazone and its conventional basic salts may be conveniently and readily avoided by use of the present products.

Phenylbutazone glycoside is a solid white crystalline substance prepared through the general reaction of the alpha-halogen monoglycose and the metallic salt of 3,5- dioxo-1,2-diphenyl-4-n-butyl pyrazolidine. While any glycose may be used, we have found it is preferable to use a member of the class of sugars known as trioses, tetyoses, pentoses and hexoses. Although the higher glycoses may be used, problems of isomerization restrict and limit certain aspects of the synthetic procedure. For this reaction, the appropriate sugar halide or alpha-halogen glycose may be either the fluoride, chloride, bromide or iodide derivative although it is preferred to use the bromide, chloride and iodide derivatives under practical synthetic conditions.

The reaction may be carried out in either aqueous, alcoholic or hydrolacoholic media, and may also be conducted in any other inert organic medium which does not interfere with the course of the reaction. It has been found that an alcoholic medium is preferred since the components are obtained in a state of purity requiring little or no purification as well as facilitating the separation of the product of the reaction. However, the products resulting after the use of other organic or aqueous solvents do not require such a degree of purification so as to render them therapeutically unusable.

It was found that the addition of small amounts of silver hydroxide, or copper powder, to this reaction will materiab 1y augment both the yield and the speed of reaction.

When silver hydroxide or copper powder are used as catalysts for this reaction the range of their concentration to be added is dependent upon the size of the reaction and will range from 0.01 to 0.10 percent of the reacting weight of the components used in the particular reaction.

The resulting phenylbutazone glycoside is soluble in water to a greater extent than phenylbutazone and is stable over the physiologic pH range. It may be administered therefore in a smaller dose to achieve a more ide'al therapeutic effect without placing the patient in jeopardy of injury which may extend from gastric disturbance to fatal consequences.

Phenylbutazone glucoside is the addition product of glucose and phenylbutazone, which is obtained as a result of the interaction between phenylbutazone and an alpha-halo glucose, as for example, alpha-brorno glucose. In carrying out this reaction a neutral solvent such as isopropyl is used.

To an isopropyl alcohol solution of alpha-bromo glucose is added a stoichiometric equivalent of either an alkaline solution of phenylbutazone in isopropyl alcohol or a. solution of the metallic salt of phenylbutazone in isopropyl alcohol. A catalyst of silver hydroxide or copper powder is utilized to complete the reaction. The glucoside of 3,5-dioxo-1,2-diphenyl-4-n-butyl pyrazolidine corresponds to the empiric formula C H N O' and analyses in' good agreement with its calculated theoretical values. This compound is to be distinguished from the acetylatcd glycosidic compounds of Morel (EX perientiae 14:294, 1958) since Morels compounds were not absorbed and had no activity. It is of interest to noted that the d-acetylated glucoside could not be obtained from Morels synthetic compound because of the extreme liability of the acetylated product. Thus, while the acetylated product has been prepared and found to be not absorbed in men, the present glucoside of 3,5-dioxo-1,2-diphenyl-4-n-butyl pyrazolidine is desirable by virtue of its activity.

Polymeric glycose derivatives may also be prepared through the use of the omega-halogen polyglycose compound in place of the alpha-halogen monoglycose and also polyoxyethylene derivatives may be formed through the use of the corresponding omega-halogen polyoxyethylene compound. When the omega-halogen polyoxyethylene derivatives are used, the corresponding polyoxyethylene derirlrative of 3,S-dioxo-l,2-diphenyl-4-n-butyl pyrazolidine resu ts.

Hydrogen bonded chelation complexes may also be prepared. These generally fall into two fundamental groupings, such as those prepared with polymeric carbohydrate gums, as for example, pectin, gum guar, algin gum arabic and gum tragacanth.

New compounds of 3,5-dioxo-1,2-diphenyl-4-n-butyl pyrazolidine may be readily prepared with anionic exchange resins which are particularly adapted to this purpose and are condensation products of phenol, formaldehyde and an alkylene polyamine, the alkylene group of which may be interrupted NH to form alkylene chains of the last two carbon atoms between nitrogen atoms. These resins are known in commerce under the trade name of Amberlite and more particularly as AmberliteIR, or Amberlite-IRP-58M or Amberlite XE-58'M and these are marketed by The Resinous Products and Chemical Company, Philadelphia, Pa. Resins of this same type are also marketed by other concerns under ditferent trade names. Some of these resins and processes for their preparation are described in U.S. Pat. No. 2,402,384, issued June 18, 1946, on an application of John W. Eastes, entitled Ion-exchange Polyamine Resins and The Methods of Preparing Same. Although resins of the class described in the aforesaid patent may be employed, it is preferred to use the anionic exchange resin which is a condensation product of dihydroxy phenyl didimethyl methane, formaldehyde and tetraethylene 136 1: amine, hereinafter called resin.

When the selected Amberlite exchange resin is reacted with 3,5-dioxo-l,2-diphenyl-4-n-butyl pyrazolidine, the resultant compound is formed by attachment of the resin in the 4 position of the pyrazolidine ring and the new compound has neither the properties of the free reagents nor 6 Example 1 In a round-bottom, three-neck glass boiling fiask fitted with a reflux condenser, and an automatic stirring device, place one liter of isopropyl alcohol to which is added exthat of a simple mixture, nor that of a salt. Thus, for ex- 5 aetly 1/10 pp 'q Stirring is Started l th new omp0und f d of 3 5-di -1,2-di and when solution is achieved, exactly 1/10 mol of the phenyl-4-n-butyl pyrazolidine and Amberlite IRP-58M f f Salt i P {Y Y PY resin does not exhibit the acidic properties of the free dlne 15 added m small quantltles W1th contmuegl stlrrmgpyrazolidine compound in its combining power with alkali When all Of e S0d1um Salt of -L p nor may it be mechanically separated into its component f l PY P has P p added, g of h y parts through extraction with organic solvents, such as pfeelpltated SllVer hYdFOXIde 18 added at 0 a d th K- benzene or chloroform, as would a simple mixture. Neither ture Slowly heated to reflux p ra edoes the formed compound ionize as would a salt and it almost lnetantanequs preclnltatlon of sodium brodoes not have the e1sctro physia1 properties f a l 15 mlde occurs which continues unt1l the reaction is com- The compound resulting from the reaction of the Arn-, p Aftefi a p t of from e to two hours of refluxberlite IRP-SSM resin with 3,5-dioxo-l,2-diphenyl-4-n-* the m ur 1s cooled to m temperature n fi butyl pyrazolidine, is a stable, homogeneous prod t ith te red. The SOlld material remaining on the filter is washed reproducible and well defined physical-chemical proper- Wlth a Small q y 0f P PY a1e0h1 and ties, which are clearly distinguishable from the convenf d ed to the filtrate. The alcohol solution thus obtained tional salts. The new compound contains from 16 to 19 1S Concentrated under reduced P e 150 0 its 1- perceht of the pyrazolidine moiety and has a sharp meltume and the whole set aslde to crystallize in an ice-chest. i point f between 211 213 Q (with decomposition) The crystals obtained are white, needlellke, meltlng with which contrasts sharply to the melting point of 3,5-dioxodeeempesltlon The Compound 15 the 8 1,2-diphenyl-4-n-butyl pyrazolidine, which is from 103 to eoslde 0f l-q p y y pyrazolidine c The new compound is insoluble in Water. correspondlngto the chemical composition of C H N O The Capacity f the resin to Combine With 5 and analyzes in good agreement with its calculated theo- 1,2-diphenyl-4-n-butyl pyrazolidine is determined by the retlcal ValuespH of the solution; by electrolyte concentration and by Theory: 63-31% earb0I1;6-43% hydrogen; 96% nitrothe pKa of the cation. Thus, a compound of the 3,5-dioxo- Be Found; 63'21% carbon; 621% y g t101% 1,2-diphenyl-4-n-butyl pyrazolidine and the Amberlite XE- nltrogen- 53 resin is f d to the extent f 0 meqjgm f The compound 1s moderately soluble in water, alcohol, resin in distilled water but this ratio is doubled so that 1.2 methanol, ethanol, qp p and insoluble in ether and meq./gm. of resin results when IM potassium chloride is beltzene and 1S sufficlenfly P after the first recrystallisuhstituted f the distilled Watch zation to be used in therapy in the form of either a tablet, The infra-red spectra of the new compound 4-resin 3,5- F 9 of Powder a liquid P p r i n such as a syrup dioxo hzdiphenyhmmhutyl pyrazolidine compound is or elixir to be administered orally or a solution for parencharacteristic for the new molecule. The characteristic teralusephenylbutazone bands are not present in the infra-red Example 2 spectra of the new compound and there is a shift in the 40 bands characteristic for the resin. This change in the infra- In place of the alpha'brorpo'glucose used In Example 1 red spectra of the component moieties of the new chelation E there be supstftuted flUOFO, and compound establishes not only the identity of the new iodo analogues in stoichlometrlc reacting equivalent chelation compound but also a new physical-chemical reamounts of of the members of the class of :Ompounds action has taken place. known as trloses, tetroses, pentoses and hexoses. The re- The compound represents a constant ratio of phenylmamder the steps are as descnbed i t 1 above butazone to resin combined at the 4 position of the py- The resulting compoupds however W111 infer m Physical razolidine ring. This ratio is constant and independent of and chemlcal Propertles depenfient P the length and reaction temperatures, concentration of reagents or stirnature of the glycose used -v tetfose, PeIltOSe ring time. Thus, when water is employed as a solvent, the and.he.xose) ratio of phenylbutazone to resin is 0.6 milliequivalents of slmllarly Should f glycoses Within a 3,5-dioxo-1,2-diphenyl-4-n-butyl pyrazolidine per gm. of Partlcular group be f f Palogen derivative resin. However, when one molar potassium chloride soluform) i respecnve lsomenc denvative of the P tion or one molar sodium chloride solution is substituted Ylbutazone W111 result The ratios of the Teaeting p oduats f h di ill water, i ratio i dohhled, so that a in these instances remain the same and the steps to be taken chelation compound representing 1,2 milliequivalents of are Similar to identical to those described in EXample 3,S-dioxo-l,2-diphenyl-4-n-butyl pyrazolidine per gm. of 1 above. The properties of the respective compounds are resin is obtained. described as follows:

Elemental analysis, percent M-P Carbon Hydrogen Nitrogen Empiric C. Number Compound formula (dee.) Thry. Fnd. 'lhl'y. Fnd. Thry. End.

1 Dihydroxypropylphenylbutazone C22H25N204 116-18 69.09 70.10 6.85 6.62 7.33 6.99 2. Phenylbutazoneerythroside o HtsNtos 187-88 67.30 67.81 6.39 6.01 6.82 7.01 3 Phylbutazonethrooside Ct H tN20 192-94 67.30 67.01 6.39 6.03 6.82 7.21 4 Phenylbutazoneriboside CuHzsNzOo 193-95 65.44 65.01 6.41 6.91 6.36 7.00 5 Phenylbutazonearabinoside C24H2 N20s 201-04 65.44 65.62 6.41 6.83 6. 36 6.41 Phenylbutazonelyxoside O21H2BN2OB 207-10 65.44 65.81 6.41 6.92 6.36 6.10 Phenylbutazonexyloside C24H2EN206 20809 65.44 65.83 6.41 6.10 6.36 6.15 Phenylbutazonemannoside C25Ha0NzO1 20 63-31 64-01 5- 96 5.81 Phenylbutazonesorboside- 25H30N207 137-88 63-31 64-10 5.43 5. 51 Phenylbutazonegluconate. C25H32N2O9 181 59.51 58.91 6.40 6.61 5.55 5. 83 Phenylbutazoneglucuronate. zaHsoNzOo 206 59. 59. 31 6.02 5.91 5. 57 5.12 Phenylbutazonemannuronate-0. C HstNgot 216 59.75 59.82 6.02 6.10 5.57 5.15 13 Phenylbutazonegalaeturonate CzsHauNzOa 241 59.75 59.61 6.02 6.21 5.57 5. 41

The following examples illustrate the this scope of invention.

The structural formula of the resultant phenylbutazone glycose compounds obtained as a result of the methods described in Example 1, above, through Example 5, below, may be represented as:

wherein R is selected from the group consisting of glycoses, having from 3 through 6 carbons and polymeric glycoses of which each glycose unit has from 3 through 6 carbons.

Example 3 In place of the alpha-bromo-glucose used in Example 1 and the halogen derivatives described in Example 2, there may be substituted in stoichiometric equivalent amounts halogen polymeric glycose derivatives, each unit of the polymer moiety having from three to six carbons, the remaining steps of the reaction being the same, although the resulting compound will produce difierent solu- 'bility product relationships to that of the monoglycose derivatives. If the polymeric halogen glycose is alpha-bromopolygalacturonate, then the resulting compound will have the empirical formula (C H N O and a melting point of 160 C. (dec.). Microanalysis per micrometric unit reveals:

Theory: 59.75% carbon; 6.02% hydrogen; 5.59% nitrogen. Found: 59.43% carbon; 6.01% hydrogen; 5.72% nitrogen.

Example 4 In place of the isopropyl alcohol used as a solvent for the reaction described in Example 1, there may be substituted any liquid member of the class of alcohols corresponding to the general formula ROH, wherein R represents a straight or branched chain alkyl group of from 1 to 6 carbons.

These alcohols may be used in a ratio of from /2 to 1 liter for each 1/10 molar reaction size. Water may be utilized to replace all or a part of the alcohol as the solvent for the reaction and when the reaction medium is entirely aqueous or when water is present in amounts, in excess of 10 percent, the following procedure for isolation of the compound is necessary. The entire reaction mixture is evaporated to dryness (under reduced pressure) and the residue mixed with ethanol and boiled for five minutes, filtered and set aside to crystallize in an ice chest. The compounds resulting may then be used in the preparation of pharmaceutical dose forms.

Example 5 In place of the silver hydroxide used in Example 1, there may be substituted an equal amount (weight for weight) of finely divided copper powder. Either catalyst may be used regardless of whether the solvent for the reaction consists of alcohol, water or hydro-alcoholic media. The ratio for the addition of the copper powder or the silver hydroxide as a catalyst for this reaction is from 0.01 to 0.1 percent of the reacting proportions.

Example 6 In a round-bottom three-neck glass boiling flask fitted with a reflux condenser and a stirring device in place exactly 1' mol of monochloropolyoxyethylene. Stirring is started and small quantities of sodium of 3,5-dioxo-1,2-diphenyl-4-n-butyl pyrazolidine is added until exactly one mol of the compound has been introduced into the reaction medium. The reaction is exothermic and cooling should be employed. The entire mixture may solidify. The solid mass is then dissolved with the aid of gentle heat, in sufiicient ethanol to cause solution of the organic compound but to leave the insoluble sodium chloride in suspension. The mixture is filtered and the solvent alcohol removed by vacuum distillation and the resulting compound is sutficiently pure to be used for a pharmaceutical dose form.

It should be noted that the polyoxyethylene derivatives have a varying molecular weight depending upon the length of the polyoxyethylene chain used as the reactant and this will determine the ultimate physical properties of the respective compounds. Thus, if a monochloropolyoxyethylene compound with a molecular Weight of from 200 to 600 is used the resulting compound will possess properties which are different from that resulting when the higher molecular weight polyoxyethylene halogen derivatives are used, as, for example, those with a molecular weight of from 600 to 2,000. The properties of typical compounds resulting from this reaction are described as follows:

The structural formula of the polyoxyethylene phenylbutazone compounds may be represented as:

wherein R is a radical selected from the group consisting of polyoxyethylene groups having a molecular weight of from 200 through 2000.

Example 7 In place of the chloro derivative described in Example 6, there may be substituted the fiuoro, bromo and iodo derivatives of the respective polyoxethylene. The remainder of the steps are the same as described with the exception of the purification step wherein a higher alcohol should be utilized, as for example, hexanol, when the higher molecular Weight compounds are used.

Example 8 The reaction as described in Example 6 may also be carried out in the presence of an alcohol solvent or an aqueous or hydro-alcoholic solvent as described in Example 4 above. Similarly, the ratios of silver hydroxide and copper powder may be utilized as described in EX- ample 5 above.

Example 9 Cholation coordination compounds are prepared by reacting phenyl-butazone with a hydrogen bonding compound. For example, one part of phenylbutazone is dissolved in 500 cc. of isopropyl alcohol, and to this is added 3 parts of gum guar. The mixture is stirred for one-half hour and then the solvent is slowly distilled at atmospheric pressure. The mixture is then wetted with 2 parts of water and granulated through a number 16 mesh sieve. The resultant compound is a creamy white powder which is dispersible in water and alcohol. It assays in good agreement with the theoretical values for both the phenylbutazone moiety and the gum guar component. When dispersed in Water there is a uniform distribution of the compound which does not sediment out and which does not permit the dialysis of the phenylbutazone radical. Infrared spectral analysis establishes the presence of a hydrogen bonded co-ordinate linkage thus confirming the presence of a molecular complex.

The preferred ratio between reacting components is from one part phenylbutazone to three parts of the gum guar, together a range of from 1:1 to l: 10 may be used. The new compound has the following structure:

In place of the gum guar described in Example 9 above, there may be substituted a reacting equivalent Weight of pectin, or psyllium, or algin, or dextran, or polyvinylpyrrolidone. The remaining steps are the same as described in Example 9 above. The preferred ratios of phenylbutazone to pectin, psyllium, algin, dextran and polyvinylpyrrolidone is 1:3 although the ratio of 1:1 to 1:10 may be used. The resulting compounds are described as follows:

The structural formula of the compounds may be represented as:

chelating coordination wherein Z is a chelating compound selected from the group of compounds such as algin, pectin, gum guar, psyllium, dextran and polyvinylpyrrolidone.

Example 11 In a suitable container fitted with 'a stirring device is placed 1 liter of distilled water and to this is added 30 gm. of 3,5-dioxo-1,2-diphenyl-4-n-butyl pyrazolidine. The stirring is started and then 40 gm. of Amberlite XE-58M anionic exchange resin, a condensation product of dihydroxy phenyl dimethyl methane, formaldehyde and tetraethylene pentamine, is added. The mixture is stirred for a period of at least 4 hours and then the insoluble material collected on a filter and washed with water. The solid material is dried and ground to a No. 40 standard mesh powder and extracted with two, 100 cc. portions of benzene. The dried powder weighs about 47 grams. The resultant powder is the new compound of 3,5-dioxo-1,2-diphenyl-4-n-butyl pyrazolidine- 4-resin. It has a melting point of from 211 to 213 C. (with decomposition). The proportion of 3,5-dioxo-1,2 diphenyl-4-n-butyl pyrazolidine in the compound is 0.6 meq. of the compound per gm. of resin. This ratio is a constant ratio for the non-saline solvent used, and is independent of concentration of reagents or stirring time.

The new resin phenylbutazone compound has 13.26 percent nitrogen content and is insoluble in water, benzene and chloroform.

The structural formula of the 4-resin-3,5-dioxo-1,2-diphenyl-4-n-butyl pyrazolidine, wherein the resin moiety consists of the condensation product of dehydroxy phenyl dimethyl methane, formaldehyde and tetraethylene pentamine, may be represented as:

wherein R represents an ion exchange resin which may be any member of the class of resins known to the trade as Amberlite resins and which are the condensation product of dihydroxyphenyl-dimethyl methane, formaldehyde, and an alkylene polyamine.

Example 12 In place of the distilled Water used as a solvent in Example 11, there may be substituted in the same quantity, molar potassium chloride solution, molar sodium chloride solution and mixtures-of these. The remainder of the steps being the same. The resultant compound isolated Will have a proportion of 1.2 meq. of 3,S-dioxo-l,2-diphenyl-4-n-butyl pyrazolidine per gm. of the resin. This ratio is a constant ratio When the saline solvent is used and is independent of the proportions of the reagents utilized or the stirring time. The structure of the compound is the same as described in Example 11 above.

Example 13 In place of the Amberlite XE-SSM resin used in Examples 11 and 12, there may be substituted in equivalent quantities, any of the anionic exchange resins which are known to the trade as the Amberlite resins and which are the condensation product of dihydroxy-phenyl dimethyl methane, formaldehyde and an alkylene polyamine. The remainder of the steps being the same and the resultant products obtained will correspond to that obtained after Example 11, having a chelation combining ratio of 0.6 meq. of 3,5 dioxo 1,2 diphenyl-4-n-butyl pyrazolidine per gm. of resin, when water is used as the solvent and 1.2 meq. of 3,5 dioxo 1,2 diphenyl-4-n-butyl pyrazolidine per gm. of resin when a molar potassium chloride or sodium chloride solution is used as the solvent, as described in Example 12. The structure of the compounds is the same as described in examples 11 and 12 above.

Example 14 When it is desired to use the glycosides of phenylbutazone, the glycuronic acid salts of phenylbutazone, and the polyoxyethylene derivatives of phenylbutazone, the polymeric chelation complexes of phenylbutazone and the -4-resin, 3,5 dioxo 1,2 diphenyl-4-n-butyl pyrazolidine in therapy, these may be administered in the suitable pharmaceutical dosage forms as for example, in the form of a tablet, capsule, or suppository. A dosage range of from 50 mg. to 1 gram, depending upon the individual patients needs, may be administered in order to obtain an analgesic, antipyretic and anti-inflammatory and micesuric effect in the treatment of gout, rheumatoid arthritis, and thrombo-phlebitis. Because of the unique properties of these compounds, it Will be generally found that the preferred dosage range will be from 50 mg. to 200 mg. given one to three times daily.

In preparing tablets the desired active ingredient is mixed with an equal amount of diluent, as for example, powdered lactose, or powdered starch, and to this is added 0.01 parts of magnesium stearate and the Whole granulated with a gelatin-water mixture, utilizing a No. 16 mesh sieve. The granulation is then compressed into tablets having the desired size and shape, so that each unit dose will contain from 50 mg. to 200 mg. of the active substance.

Capsules may be prepared by filling the appropriate gelatin container with the granulation or with a mixture of equal parts of the active ingredient and the diluent. The unit dosage range to be employed when capsules are manufactured is from 50 mg. to 200 mg. of the active compound.

Suppositories are manufactured by mixing an appropriate suppository base, as, for example, cocoa butter, polyoxycthylene glycol, or mixtures of these with the active ingredient so that each suppository will contain about 50 mg. to 200 mg. of the active compound per unit dose. There is no need for diluents or binders since the compounds are both stable and dispersible.

Parenteral solutions are prepared by dissolving the water soluble members of this series, as for example, phenylbutazone glycoside, in water-for-injection so that each cc. will contain 100 mg. of the active substance. It may be found to be convenient to use a range of from 50 mg. to 500 mg. per cc., which may be prepared through adjusting the appropriate solvent-active ingredient-temperature relationships at the time of manufacture but for ordinary therapeutic use, solutions containing 100 mg. per cc. will be found most satisfactory. The solutions for parenteral use are packaged in glass ampules and hermetically sealed. The solutions are stable and may be sterilized by the conventional techniques as for example, autoclaving.

The compounds of the present invention are therapeutically co-extensive with phenylbutazone and its metal salts. Thus, they may be employed as analgesics, antipyretic compounds, antiinfiammatory agents, uricosuric agents and particularly in the treatment of such conditions as rheumatoid arthritis, acute bursitis, thrombophlebitis and gout.

It is not desired to be limited except as set forth in the following claims, the above description being by way of illustration of the invention.

What is claimed is:

1. A pharmaceutical composition in unit dosage form comprising from 50 to 200 mg. of a compound selected from the group consisting of a compound having the formula:

wherein R is a polyamine ion exchange resin moiety comprising the condensation product of phenol, formaldehyde and an alkylene polyamine, a polyoxyethylene moiety having a molecular weight of from 200 through 2,000, a glycose having from 3 to 6 carbon atoms in chain length, a polymeric glycose in which each glycose unit has from 3 to 6 carbon atoms in chain length, and a hydrogen bonded compound having the formula:

wherein Z is selected from the group consisting of gum guar, algin, pectin, psyllium, polyvinylpyrrolidone having a molecular weight of from 10,000 to 90,000 and dextran, having a molecular Weight of from 6,000 to 90,000 and a pharmaceutically acceptable carrier therefor.

2. A pharmaceutical composition of claim 1, said unit dosage form being a tablet.

3. A pharmaceutical composition of claim 1, said unit dosage form being a capsule.

4. A pharmaceutical composition of claim 1, said unit dosage form being a suppository.

5. The method of reducing pain which comprises administering to a human requiring such treatment a therapeutically sufiicient quantity of a compound selected from the group consisting of a compound having the formula:

wherein R is a polyamine ion exchange resin moiety comprising the condensation product of phenol, formaldehyde and an alkylene polyamine, a polyoxyethylene moiety having a molecular weight of from 200 through 2,000, a glycose having from 3 to 6 carbon atoms in chain length, a polymeric glycose in which each glycose unit has from 3 to 6 carbon atoms in chain length, and a hydrogen bonded compound having the formula:

wherein Z is selected from the group consisting of gum guar, algin, pectin, psylli-um, polyvinylpyrrolidone having a molecular weight of from 10,000 to 90,000 and dextran, having a molecular weight of from 6,000 to 90,000 and a pharmaceutically acceptable carrier therefor.

6. The method of claim 5 which comprises administering to a human a pharmaceutical composition of claim 1.

7. The method of producing an anti-inflammatory effect which comprises administering to a human requiring such treatment a therapeutically sufiicient quantity of a compound selected from the group consisting of a compound having the formula:

wherein R is a polyamine ion exchange resin moiety comprising the condensation product of phenol, formaldehyde and an alkylene polyamine, a polyoxyethylene moiety having a molecular weight of from 200 through 2,000, a glycose having from 3 to 6 carbon atoms in chain length, a polymeric glycose in which each glycose unit has from 3 to 6 carbon atoms in chain length, and a hydrogen bonded compound having the formula:

CHg-CHz-CHz- Hg wherein R is a polyamine ion exchange resin moiety comprising the condensation product of phenol, formaldehyde and an alkylene polyamine, a polyoxyethylene moiety having a molecular weight of from 200 through 2,000, a glycose having from 3 to 6 carbon atoms in chain length, a polymeric glycose in which each glycose unit has from 3 to 6 carbon atoms in chain length, and a hydrogen bonded compound having the formula:

wherein Z is selected from the group consisting of gum guar, algin, pectin, psyllium, polyvinylpyrrolidone having a molecular weight of from 10,000 to 90,000 and dextran, having a molecular weight of from 6,000 to 90,000 and a pharmaceutically acceptable carrier therefor.

10. The method of claim 9 which comprises administering to a human a pharmaceutical composition of claim 1.

References Cited FOREIGN PATENTS 2/ 1957 Australia 260-3l0 B OTHER REFERENCES Chem. Abst., vol. 53,20040 f (1959).

STANLEY I. FRIEDMAN, Primary Examiner 

